Method and form for making dress shields



Nov. 12, 1940. M.' E. HANSEN 2,221,135

METHOD AND FORM FOR MAKING DRESS SHIELDS Filed July 9, 1936 PatentedNov; 12, 1940 UNiTED STATES METHOD FORM FOR MAKING DRESS SHIELDS MerrillE. Hansen, Akron, Ohio, assignor to American Anode -Inc.,

tion of Delaware Akron, Ohio, at corpora- Application July 9, 1936,Serial No. 89,857

I 6 Claims. This invention relates to the manufacture of dress shieldswhich usually comprise arubber element known in the trade as a dressshield plate and consisting of two crescentiform flaps joined alongtheir concave margins, arranged within a textile fabric covering, andhas for. its principal objects the provision of economical and efficientprocedure for making the rubber plates of dress shields in one-pieceseamless fashion providing a superior and more effective shield, and theprovision of a novel deposition form especially adapted for use in therapid and efiicient manufacture of such rubber dress shield platesdirectly from a liquid dispersion of rubber. Other objects will beevident from the following description of the invention in whichreference will be had to the accompanying drawing of which:

Fig. 1 is a sectional elevation showing the form of the presentinvention being dipped into a liquid dispersion of rubber;

Fig. 2 is a vertical section taken on line 2 2 of Fig. 1; l

Fig. 3 is a perspective view illustrating a subsequent step in themanufacture of the dress, shield Plate; and v Fig. 4 is a perspectiveview, partially broken away for clarity of illustration, showing afinished dress shield embodying the product'of the present invention.

In the present invention, I utilize a generally planar deposition formor mold ID of any suitable, preferably rigid, material such as wood,glass,

In a preferred procedure, the form 10, desirably made of a metal such asaluminum, is dipped into an aqueous liquid dispersion of rubber such asa suitably compounded liquid rubber latex l4, and an enveloping coatingof latex rubber l5, preferably about 0.005" thick (when finished) isdeposited over the form I!) up just to the lower end of the handle II.The depositionof latex rubber upon the form may be effected by simplydipping the form one or more times into the latex, either with orwithout prior intermediate applications of heat, or coagulants, or otherlatex-agglomerating materials to the form or to the deposited rubber, orwith the aid of suction 5.. if a porous form be used, or byelectro-phoretic means, or in other manners.

For consistently producing highly uniform rubber deposits and forsecuring generally supe rior quality and efficiency in manufacture, Ipre- 10 fer, however, to'effect the deposition by a process of thecharacter described in U. S. Patent No. 1,908,719 granted May 16, 1933,to Edward. A. Willson, in which the deposition form is coated with avolatile solvent solution of a latex coagu- 15:.

After the rubber deposit has acquired a self- 25.-

sustaining consistency as a result of treatment with coagulants ordrying or both, and preferably after the deposit'is substantiallycompletely dried, the rubber is severed along the sharp edge [3 asillustratedin Fig. 3 by pressing a suitable 30.

instrument [6 against the ordinarily somewhat thinner rubber overlyingthe sharp edge. For added efficiency insevering the rubber, suchinstrument conveniently may be electrically heated to a temperatureapproaching dull red heat, and 35 desirably should include a cuttingpoint I! or knife edge for use in cutting any rubber which may have beendeposited across the supporting. handle I I. The severed rubber depositmay next be removed from the form, dusted with soap- 40 stone to preventadhesion between the two flaps, and then dried, if further drying benecessary, and vulcanized in the usual manner.

Finally, the finished rubber plate I5 is preferably although notnecessarily associated with 45 and sewed into an enveloping textilecovering formed of four crescentiform fabric pieces l8, l8 stitchedtogether along their edges in the manner heretofore practiced indress-shield manufacture to produce the final shield illustrated 50 inFig. 4. 1

The simplicity and effectiveness of the procedure herein described makespossible the chicient manufacture of rubber dress-shield plates withminimum waste of material and low cost, 5;;

' while a dress shield embodying the rubber plate produced in thepresent invention is especially safe and reliable as the one-pieceseamless structure of the plate eliminates any possibility of leakagewhich frequently has occurred in prior plates usually having a cut-seamalong the armpit line of joinder between two separately formed rubberflaps. The spaced-apart relation of the flaps and the curved line ofjoinder between the flaps provide for fitting the shield snugly andwithout buckling or wrinkling over the anmpit of a dress. The free edgesof the two flaps are clean cut and free from planar curvature therebyavoiding any tendency to curling, while the high quality and generalresistance of tough unmasticated latex rubber deposited in final formdirectly from latex permits repeated washing and rough usage of theshield without substantial injury to the rubber plate.

The term liquid dispersion of rubber as used in the specification andclaims is intended to include all fiowable dispersions of rubber andanalogous natural or synthetic products in liquid vehicles, includingdispersionsof rubber in volatile organic solvents such as the so-calledrubber cements, as well as natural or artificially prepared aqueousdispersions of rubber. All such liquid dispersions of rubber may containany desirable compounding, vulcanizing, stabilizing, thickening,thinning or other conditioning agents, and may be diluted, thickened,thinned, vulcanized or otherwise preliminarily treated according toknown procedures.

The principles of the invention herein set forth may be utilized inmanufacturing articles other than dress shields, and numerousmodifications and variations in the procedure, apparatus, and materialsas described may be made without departing from the spirit and scope ofthe invention as defined by the appended claims.

I claim:

1. The method of making a seamless rubber dress-shield plate whichcomprises providing a generally planar deposition form having aconcavo-convex crescentiform outline corresponding to the desireddress-shield plate and having a relatively sharp edge along its convexmargin, coating the deposition form with a liquid rubber composition,solidifying the composition to produce an enveloping coating of rubberupon the form, and slitting the rubber along the convex margin bypressing the rubber against the said relatively sharp edge.

2. The method of making a seamless rubber dress-shield plate whichcomprises providing a generally planar deposition form having aconcavo-convex crescentiform outline corresponding to the desireddress-shield plate and having a relatively sharp edge along its convexmargin, coating the deposition form with a liquid rubber composition,solidifying the composition to produce an enveloping coating of rubberupon the form, and slitting the rubber along the convex margin bypressing the rubber against the said relatively sharp edge with a heatedinstrument.

3. A dipping form of the character described comprising a generallyplanar body of substantially rigid material having a concavo-convexoutline, the said body being relatively thick at the concave margin andtapering gradually to a substantially sharp edge at the convex margin.

4. A dipping form of the character described comprising a generallyplanar body of substantially rigid material having a concavo-convexoutline, the concave margin being transversely rounded and the convexmargin being relatively sharp.

5. A dipping form of the character described comprising a generallyplanar body of substantially rigid material having a concave-convexorescentiform outline, the form being transversely rounded andrelatively thick at the concave margin tapering to a thinner andrelatively sharp edge at the convex margin, and a supporting handleextending from the convex margin in the plane of the form body.

6. A dipping form comprising a relatively thin body of substantiallyrigid material having a concavo-convex crescentiform outline including aregularly curved concave margin and regularly curved convex marginextending from one extremity of the concave margin to the otherextremity of the concave margin, the formedge along substantially theentire length of one of said margins presenting an anvil surface adaptedto cooperate pressurely with an instrument to efiect severance of rubberdeposited over the surface, and supporting means extending from themargin presenting the anvil surface.

MERRILL E. HANSEN.

